modbus-rtu-private.h
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/*
* Copyright © 2001-2010 Stéphane Raimbault <stephane.raimbault@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _MODBUS_RTU_PRIVATE_H_
#define _MODBUS_RTU_PRIVATE_H_
#define _MODBUS_RTU_HEADER_LENGTH 1
#define _MODBUS_RTU_PRESET_REQ_LENGTH 6
#define _MODBUS_RTU_PRESET_RSP_LENGTH 2
#define _MODBUS_RTU_CHECKSUM_LENGTH 2
#ifdef NATIVE_WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
/* WIN32: struct containing serial handle and a receive buffer */
#define PY_BUF_SIZE 512
struct win32_ser {
/* File handle */
HANDLE fd;
/* Receive buffer */
uint8_t buf[PY_BUF_SIZE];
/* Received chars */
DWORD n_bytes;
};
#endif /* NATIVE_WIN32 */
typedef struct _modbus_rtu {
/* Device: "/dev/ttyS0", "/dev/ttyUSB0" or "/dev/tty.USA19*" on Mac OS X for
KeySpan USB<->Serial adapters this string had to be made bigger on OS X
as the directory+file name was bigger than 19 bytes. Making it 67 bytes
for now, but OS X does support 256 byte file names. May become a problem
in the future. */
#ifdef __APPLE_CC__
char device[64];
#else
char device[16];
#endif
/* Bauds: 9600, 19200, 57600, 115200, etc */
int baud;
/* Data bit */
uint8_t data_bit;
/* Stop bit */
uint8_t stop_bit;
/* Parity: 'N', 'O', 'E' */
char parity;
#ifdef NATIVE_WIN32
struct win32_ser w_ser;
DCB old_dcb;
#else
/* Save old termios settings */
struct termios old_tios;
#endif
} modbus_rtu_t;
#endif /* _MODBUS_RTU_PRIVATE_H_ */